#define _USE_MATH_DEFINES
#include <bits/stdc++.h>
using namespace std;

//template
#define rep(i,a,b) for(int i=(a);i<(b);i++)
#define rrep(i,a,b) for(int i=(a);i>(b);i--)
#define ALL(v) (v).begin(),(v).end()
typedef long long int ll; const int inf = 0x3fffffff; const ll INF = 0x3fffffffffffffff;
template<class T> inline bool chmax(T& a,T b){ if(a<b){a=b;return 1;}return 0; }
template<class T> inline bool chmin(T& a,T b){ if(a>b){a=b;return 1;}return 0; }
//template end

int dp[3010][3010];

int main(){
    int n; scanf("%d",&n);
    vector<int> a(n+1),b(n+1),d(n);
    rep(i,0,n+1)scanf("%d",&a[i]);
    rep(i,0,n+1)scanf("%d",&b[i]);
    rep(i,0,n)scanf("%d",&d[i]); sort(ALL(d)); dp[0][0]=inf;
    rep(i,0,n+1)rep(j,0,n+1){
        if(i==0&&j==0)continue;
        int idx=upper_bound(ALL(d),a[i]+b[j])-d.begin()-1,ma=0;
        if(i)chmax(ma,dp[i-1][j]); if(j)chmax(ma,dp[i][j-1]);
        dp[i][j]=min(idx,ma-1);
    }
    int ans=0;
    rep(i,0,n+1)rep(j,0,n+1)if(dp[i][j]>=0)chmax(ans,i+j);
    printf("%d\n",ans);
    return 0;
}